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Fig. 1. Ommatidial rotation during PCP establishment in Drosophila
eye. (A) Schematic presentation of ommatidial rotation in 3rd
instar larval eye disc. Photoreceptors differentiate behind the morphogenetic
furrow (MF, vertical yellow line). Five-cell preclusters are first organized
in the AP axis. As photoreceptors become specified in the precluster, the
group of cells simultaneously undergoes a 90° rotation towards the equator
(horizontal yellow line). Green cells highlight R3/R4 precursors, and red
marks future R1/R6 (stained with anti-Bar in C,D). (B) Tangential
section of adult eye with ommatidia having completed 90° rotation
(equator: yellow line). Right panel shows schematic presentation with dorsal
and ventral chiral forms indicated with black and red arrows, respectively.
(C,D) Larval eye disc with differentiating ommatidial
preclusters posterior to MF, stained with neuronal marker Elav (blue; labeling
all photoreceptor nuclei), Bar (red; R1and R6; also indicated in red in A) and
Boss (green; labeling R8 in the center of the cluster). (C) Whole disc; (D) a
higher magnification of a ventral area. White bars in D indicate the degree of
rotation of the respective cluster. Anti-Bar-staining is detected from about a
30° angle to the posterior margin of disc, where all clusters acquire a
90° angle from their original position.
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